Generally Available: Claude Fable 5.1, Claude Sonnet 5.5, GPT-5.6 Terra, and GPT-5.6 Luna

Claude Fable 5.1, Claude Sonnet 5.5, GPT-5.6 Terra, and GPT-5.6 Luna are generally available with full Kiro support. Expanded capacity supports more dependable access for production workloads. GPT-5.6 Sol remains Experimental. Fable 5.1 remains available to Kiro Enterprise organizations in US East (N. Virginia) (us-east-1). Sonnet 5.5 remains available across the Kiro IDE, CLI, Crew, and Web. GPT-5.6 Terra and Luna remain available in the Kiro IDE, CLI, and Web. Sonnet 5.5, GPT-5.6 Terra, and GPT-5.6 Luna are available for Pro, Pro+, Pro Max, and Power customers in the US and EU geographies. The Preview label for Fable 5.1 and Experimental labels for Sonnet 5.5, Terra, and Luna no longer apply. The Kiro Excluded Models indemnity exception also no longer applies to these models. To load the latest model list, restart the IDE or CLI, run kirocrew restart for Crew, or refresh Web in your browser. Learn more ->